Smokey the cannon is heard after each Longhorn score as two blank 10-gauge shot- gun shells are fired. A possible fuel that could be used to initiate firing is acetylene (C2H2) (g). The heat of combustion of C2H2 at 25 C is 310.61 kcal/mol. Given 4 g of C2H2 (g), cal- culate the amount of energy given off in the reaction.